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The CC540's adjustable boom mic has a pivot feature, so you can adjust the microphone position to get the best speech pickup possible, while simultaneously eliminating unwanted background noise. The adjustable headband and leatherette ring ear pads provide a snug, comfortable fit, and you can easily replace the ear pads if they become worn. Additionally, the ear cups swivel 90 degrees in order to provide the best fit. The microphone has a 100 Hz to 4.5 kHz frequency response, capturing the most important frequencies used in normal speech, and the headphone's 200 Hz to 4.5 kHz frequency response provides easily intelligible audio.